There have been more than 200 overturned calls this season. But are coaches using their challenges wisely? We reviewed them to find out.

Ben Cohen

NBA coaches spend countless hours crafting game plans, diagramming plays and managing the personalities in their locker rooms. Now they have something else to worry about: picking the right time to twirl their fingers.

This is the first season that coaches have the power to challenge one call per game—and only one call per game—by spinning an index finger and begging referees to take another look. They’re not big fans of the rule change. Neither are the refs. But even if they don’t like it, they can take advantage of it.